Billie Jean King for Citizen Watches To celebrate 25 years of being the official timekeeper of the US Open and its recent partnership with tennis icon Billie Jean King, Citizen Watch just unveiled two special edition timepieces.

Besides, if there had been a race to make the first chronograph—this is, after all, the Speed Issue—Piguet and Nicole would have crossed the finishing line four decades after the man who first made a timepiece called a chronograph.

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